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dax: change bdev_dax_supported() to support boolean returns

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The function return values are confusing with the way the function is
named. We expect a true or false return value but it actually returns
0/-errno.  This makes the code very confusing. Changing the return values
to return a bool where if DAX is supported then return true and no DAX
support returns false.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Dave Jiang
2018-05-30 13:03:46 -07:00
committed by Darrick J. Wong
parent ba23cba9b3
commit 80660f2025
6 changed files with 22 additions and 24 deletions
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8
include/linux/dax.h
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@@ -64,8 +64,8 @@ static inline bool dax_write_cache_enabled(struct dax_device *dax_dev)
struct writeback_control;
int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff);
#if IS_ENABLED(CONFIG_FS_DAX)
int __bdev_dax_supported(struct block_device *bdev, int blocksize);
static inline int bdev_dax_supported(struct block_device *bdev, int blocksize)
bool __bdev_dax_supported(struct block_device *bdev, int blocksize);
static inline bool bdev_dax_supported(struct block_device *bdev, int blocksize)
{
return __bdev_dax_supported(bdev, blocksize);
}
@@ -84,10 +84,10 @@ struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev);
int dax_writeback_mapping_range(struct address_space *mapping,
struct block_device *bdev, struct writeback_control *wbc);
#else
static inline int bdev_dax_supported(struct block_device *bdev,
static inline bool bdev_dax_supported(struct block_device *bdev,
int blocksize)
{
return -EOPNOTSUPP;
return false;
}
static inline struct dax_device *fs_dax_get_by_host(const char *host)